Some advancements have been done to include more physically motivated BH seeding prescriptions (in smaller-scale/zoom-in simulations) based on the properties of the gas (or stars), within cosmological hydrodynamical simulations
(e.g., [1]}, [2]}, and references therein)
usually linking the formation either of low-mass (light and medium-weight) seeds on local gas/stellar properties [3]}, or of heavy seeds to low metallicity, high-density gas cells (e.g., the romulus simulation presented by [4]}) or to regions with high gas and stellar density (e.g., [5]}).
